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[2)(1)TC(q)= q副本3-10q 2+17q+66tfc = TC (0) = 66，bait VC = TC-tfc = q 3-10q 2+17q(2)TVC(q)= q 3-10q 2+17q；duac=tc/q=q^2-10q+(66/q)+17 avc=tvc/q=q^2-10q+17,afc=tfc/q=66/q,mc=tc'；=3q^2-20q+17【3】q = 10x tfc = 3 * 1000 = 3000 TVC = 50x = 50 *(q/10)= 5q TC = 5q+3000 AC = TC/q = 5+(3000/q)AFC = 3000/q AVC = 5mc = TC & # 39；= 5 【7】(1)q=12l+6l^2-zhi0.1l^3 apl=q/l=12+6l-0.1l^2 APL & # 39；=-0.2L+6=0，L=30，APL(最大)= APL(30)(2)mpl=dq/dl=12+12l-0.3l^2 mpl & # 39；=12-0.6L=0，L=20，mpl (max) = mpl (20) (3) apk = q/k，k是多少dao？ 這個答案被網民采納了。